"Mwahahaha!" the human twirled his mustache, surveying the land of helpless ponies he was about to conquer. "I am from another universe! Therefore I carry my own physics bubble with me, and I am immune to magic! Now I will conquer this land of helpless ponies with my amazingly overpowered, out-of-context super power, mwahahaha!!!"
~~~~ 10 minutes later ~~~~
"I'm so sorry, Twi!" tears streamed down Rainbow Dash's face. "I couldn't have been going more than three or four hundred miles at hour! Not even a filly would have been hurt by that!"
"It's ok, Dash," Twilight comforted her friend tenderly, magicking the blood smears out of her coat. "He was from another universe. That meant he carried his own physics bubble with him, so cartoon physics didn't apply to him. You couldn't have known."
It's simple physics really, mass times velocity. Get it going fast enough and you could wreck a tank with a paper airplane.
That said, poor Rainbow. "tis a horrible accident right there, just bit too much reality.
10330008
Specifically (not to accuse you of not knowing this), it's 1/2 Mass x Velocity2, meaning if you double the velocity... you have quadrupled the kinetic energy, which is why a car crashing at 120 miles per hour is... not going to simply do three times as much damage to itself and everything around it compared to if it was going 40 miles per hour (sixteen times the usual crash test kinetic energy).
(I would recommend watching that, because it's kinda interesting, seeing the results of such a crash test)
For the next episode: Does pegasus-induced lighting does count as magic? Inquiring minds want to know.
(No, really. i am curious)
10331935
Personally I would say say that no, lightning isn't magic, even if the generation method is. And yes, that's another good example of the general failling of the "I'm immune to magic ponies can't hurt me!" trope.
Checking my list, "generic background pegasus" is currently chapter 15, though things may shift around between now and then.
...
oof
10331998
I would, however, say that as soon as it hits the physics bubble, it's no longer direct able, and takes the shortest/convenient path to ground. It's not nearly as effective as you would think.